They look like objects you'd find in a workshop, but these are actually two common things you'd want to find and use while sitting at a dinner table, at least if you don't have problems with sodium.

They're actually stainless steel

salt and pepper shakers.

You twist them to get at the seasonings. They're actually built like springs and are not solid bolts.

They're deceptive and interesting, and yet there's reality. Sean Michael Ragan bought these for a gift at theSan Francisco Museum of Modern Artbecause they looked cool. However, he discovered something while using them:

To begin with, they are scarcely identifiable as salt and pepper shakers
to a person uninitiated in their use. Guests have to ask for
instructions if they want salt or pepper. Secondly, they hold miniscule
amounts of their respective spices. Refilling them requires a small
funnel or a weighing paper or some other extra tool to pour into the
narrow channel of the spring. Finally, they don't work very well: To
dispense salt, for example, one bends the spring to one side, thereby
opening gaps between the coils, and shakes some out. This takes some
finesse because if you don't bend enough, nothing comes out, and if you
bend too much, too much comes out. To add insult to injury, salt and
pepper tend to get stuck in between the coils when sideways pressure is
released. This prevents the spring from returning completely to its
straight "screwmorphic" shape and thoroughly ruins the illusion. So you
have to wipe or scrape them off after each use to dislodge the trapped
grains of spice.